Reactive power in the power grid
The reactive power is the alternating component of the electrical power and usually undesirable or to be kept as low as possible. The alternating component is always reversed in its direction (sign, positive to negative to positive, etc.), as this power oscillates back and forth between the consumer and the energy source. In the case of purely ohmic loads (electrical resistance), the angle φ is equal to zero and thus the reactive power is also zero. In the case of inductive consumers (electrical coil) and capacitive consumers (electrical capacitors), however, this is different, since electrical voltage is fed back into the grid.
Capacitive and inductive loads differ only in that the phase shift occurs in different directions (the result remains the same).
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